/*
 * Demonstrate some pecularities of array passing in C.
 */
#include <iostream>

using namespace std;

// Each version receives the same size-5 integer array from the main pgm.

// Receive it as declared in main.
void rcvA(int arr[5])
{
	cout << "rcvA: ";
	for(int m = 0; m < 5; m++)
		cout << arr[m] << " ";
	cout << endl;
}

// Receive it as the system sends it -- a pointer to the first item in the
// array.
void rcvB(int *arr)
{
	cout << "rcvB: ";
	for(int m = 0; m < 5; m++)
		cout << arr[m] << " ";
	cout << endl;
}

// Since it sends a pointer and ignores the array size anyway, the system
// lets you leave it out here, too. 
void rcvC(int arr[])
{
	cout << "rcvC: ";
	for(int m = 0; m < 5; m++)
		cout << arr[m] << " ";
	cout << endl;
}

// In fact, so long as the system is going to ignore the size anyway, we can
// write what we want.  The 1024 doesn't make the array that large,
// however; it's however large its creator made it.  rcvD can't find out.
void rcvD(int arr[1024])
{
	cout << "rcvD: ";
	for(int m = 0; m < 5; m++)
		cout << arr[m] << " ";
	cout << endl;
}

int main()
{
	// Here's the array all the fuss is about.
	int arr[5];

	// Put some stuff there.
	for(int i = 0; i < 5; ++i)
		arr[i] = 2*i -3;

	// Do exactly what the functions do.
	cout << "main: ";
	for(int m = 0; m < 5; m++)
		cout << arr[m] << " ";
	cout << endl;

	// Now run the functions.
	rcvA(arr);
	rcvB(arr);
	rcvC(arr);
	rcvD(arr);
}